Almost everyone is better than your current scratch campaign.
How many posts do you make every week? If you make 50+ posts, Dadice is the best chioce, second is bit-x.com. If you make over 200 posts, bit-x is your best choice, but bit-x needs phone verification. If you make less than 40 posts, coninroyale and bitdice.me campaigns are best, they give 0.04 per week, just posting 20 posts per week.
You missed out mBit Casino and BitBingo.io campaigns. Both pay 0.09BTC/bi-weekly/30 constructive posts. Even if participants remain short of the required number, the posts get rolled over into the next term.
Yes, sorry, I didn't notice them because they are new campaigns, their rules are good, and with very high rate, if they don't set a maximum limit, that campaign will attract more people.
There is no maximum limit. Participants are free to post as much as they want. The rates are high enough so that even if they go well above the minimum required, they are still likely making more post than pay per post campaigns.
In case there is some top quality poster who posts a lot turns up, then extra payment is made.